Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757d3ab1d64777463037239f8b5a1e5739e47c43e32c7a204c307d3e6001a356' 
  AND token = 'iFrdXPhm0+s80Rv+6cA5Escz5hUe3rNUQ/4/WUJTVv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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