Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c588c1aeaf6224132ee4012b37dbe73f6740ac8e51f26debb66f605a45aa2eec' 
  AND token = 'UKiekpCX0B75QXWeLSIV8cw9xtTfw4Girp6Xm2RNuj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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