Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851b2a6814508e190b123d49647c2053ddea70f94d9e663bd80e73e42b461624' 
  AND token = '8rnO1ejRWBRl6tYe1bMEDmkMm0wHpShyaxgVvkBJ+PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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