Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c80af35e7ceb66bcb99bad5eced356edb5640d0871bde6b25314559686c6b5' 
  AND token = 'w52OIr1DhlEjUvw9UNjUrX6tSiny0fxsDwP7P3xQutg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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