Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bd0906f183307438cc3ec97401f98f757656209e071b2054ef34fb19a911df' 
  AND token = '7IKU+pCwZGaMGLguBmZejUcUFrRe0sminI405G1s6WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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