Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1efbc87f128c66acd5baeba9a1cb268472178f21ce3c6e5faa207880acb3e9' 
  AND token = 'p2WHIXbgYOUIFQh2GUkqUuDdNUuHgpFOTnc+Y7meu2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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