Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfcb4e34b51bf08d39e7a0cd33d0d61ec1439587bf093092ceb1ef1ee88f2e1' 
  AND token = 'nh7yjzjqxA/86Wqf/nQBjEQvvl3QQ3Fai30bwPofnvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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