Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c9cc7ff4bf2f9318370ebe473fc21a22dfe5ef2dd91543a74fb278091baa6a' 
  AND token = 'FfkxJSB3ZyVkcDOiNTWsmASPSkSLEbXZHuf4wAf+scQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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