Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6df4fb86ebeee92a5153c2a3832a52fa08c86434244760242e4b910c6b3fb7' 
  AND token = 'slycBj0QOokdOnUjC0b6zNz65Ksq17DZ3wshOHoaOFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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