Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f8b8f887408fb433d341bcea5ad214cbf13fec4155be1bd51ba1dc9887cc5e' 
  AND token = 'd2Uz+zVXSEr9tTWWCoCzwTq/GYzOrAdQzvU5+3hZxe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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