Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadae8f4c8de107e44eb2e815946481b2ffcf6a5c167418117e9b28a14ee7d52' 
  AND token = 'z1MU1jekZkIxg+UadLBVVf9+DiKkgQ7ZD/0wvaBhtpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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