Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e250b5af141d346465180c442326257ad1956bff9ca6592fcf4a250ac7daa2a4' 
  AND token = 'P9ntgPp/z5oHFdGYfEf6/cUhcm7m73G38z3nSeLEKmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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