Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2289e7572fa4e7a4ab412c4c2c58efeffd1005135664b76e368f02800d39ae3' 
  AND token = 'YWZsQ5Gf7EHZBzkXtkUv6t1lxzCS+PJD/Uyisu8T6U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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