Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0be959b519e038e10062ea766e72f52739bf56ea54380c423e011a1f05b224c' 
  AND token = 'fTDg/Z0ks75tm/Bmzx49iQbAw3RRCLyyOeLVrNOqarw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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