Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736b13cdcc81ca2305088b373816de8dc992a8ee6824588433033f21fc0682a0' 
  AND token = 'KDlpBBbrnKMrK6vhjwsNvzeahBuHtFtIl8kUBdTF5n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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