Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75e8e16e70151eca7c4fb4d652f821768aa39212c37dad754bd2ccca57a0e76f' 
  AND token = 'S5x/KdSAcgLPc6ue9pDDCcIUgXEGlRkvDeEIgQc2qFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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