Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ec6d1d1304fe84ea10cafdc8aea22946b9f75bbd50c4e8bbd84e4a4a12c155' 
  AND token = 'E/3ZDdR1SECKICLGAgsAcavVszSgJQw9Ud6kK83KO+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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