Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7b20af27980cd9fe6a27b6537e76b68a8d939aef5c1284ac64658a1a80b597' 
  AND token = 'XsZaCIzO+MDvGfT1RPVdPeTos/dwN4dZ8GclILu+Xik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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