Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ca23356efbc7ff43c509312a57a1a1229bbcb8519a1f6b97bf0ee123b6b517' 
  AND token = 'LQ4+oDcuLhgp1BCVGAza2dNYNUf51dcz7iG5xDi1UY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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