Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca888376c1eca51cb2611f2a92567f5578a4e571f7c094ca2b5c23cd6de82f40' 
  AND token = 'wHO/EsIZzqYjN7LXQvaUZjRbfkSSaH7axxRQ/UDL53Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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