Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4c57d0e389d0a780e8cf6609702e75e8f205a7a505ed23d55f4cbc470b2bee' 
  AND token = 'SOolovvsPg/xce7bLQekESSxBhleTHH9wzr8H4np2II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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