Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b0667f5418e90047ebcb8f30828bb7ba51bd83ae57afb7b1c410f7a1dfb8f1' 
  AND token = 'BRJqshh+4ibOH5rxwuCfPJvEP3ZtxosY5TpbBpJrk2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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