Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4d7b89c7b3e7b54a67dc709b5cd0d88b0fb1e12c89b80abe7058fae94e763f' 
  AND token = 'bYtpFZSGqGzMWld9nW+I7gUZWgDw1noR+01Yl68Kp7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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