Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b9332ef092acef3fa8e15e6c145636c3085666a94dc76f2b713c33b0aa4bbd' 
  AND token = 'RWZWAa8h9QBHYCX9fO3Jc9oQjAdZJM9TabTjIdyLi0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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