Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0b8409f60f227ac3f4533498b44c377895a6a52b71c617d4b6b25ad0ae7173' 
  AND token = 'fhMzvQg43taErdMmBtDj2MDsOEVfcrSFqfhOPB7c/Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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