Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6945cf7add2244607347fce75871321466d8ad9b4e54aaafc7f8ab4884ada9b8' 
  AND token = '2byVU4au42KxS603O36gcC7DV4k2kVRo5rAQ1UCy7iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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