SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c99a01965a9636be5607afbe24b216c32728388a9e6e6cd91360e4d385fe081a' 
  AND token = 'XTn3VUP8ocPYaSFj2m1qzNJIkuxfbEMSBcnJGhhWvtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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