Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5d27e7efbb5c6b0e0b6270f57b1ac60541a1dc12375a1799e90117c3a0ce0f' 
  AND token = 'tM18cXu1PwMFWcdsK/wQGPHv45SOYMP6E4gVQHRzI3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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