Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe66b811ec5eac7cc3c2a6ecf01d1225493c4d1a3b84ea636dace06450a4dd91' 
  AND token = 'Qk0ceHd72y1vWsXJeZ6Hl5LkaFU+q/FPBJ4K2qPjS2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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