Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9686adb5c3e1d908da061c1edeee6b79caa93f6e51c5423a166d68e38d4c19b' 
  AND token = '+mmMOnuoNVEgyXhuKTedOCugGdOgRP+9BGRcD5xeIWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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