Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ec8274023fc0e347fc384ab5def6d00c45c1d5479f30e20d3cf09ae37b3316' 
  AND token = 'N2QpsSSMWihp0yiEJKamps6BmscBKUHistamXJacxwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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