Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b280f93e76eedbffae4ef9dba75071aba9ea0ea7a803e0f5c891c331423d86b' 
  AND token = 'ZrDPPrk/YOMHUwvgAcsJWi+MbVcDw8NhjjzRAkTOb5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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