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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afdfc471c1359c320b7df9ee4b236edd7d377deb682e3d5f072ec5f5c0fe993' 
  AND token = 'RrwpSUrtN8OTpYox8WfIMXny9iy9aC+SJO7v32fV6W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}