Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc73ffa8e2a9e2bd760993da475d5152370a4a23d0d70f2d5c9667cc4b0968b' 
  AND token = 'TCmG/sQQEi/grHOdp6mkMaEA4xEJwrNZTTvpEImh5ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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