Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad18fb85215bb854eab6a6eaec3aae8bdea0c31844da4026383e347c6f9029bf' 
  AND token = '8R+l7I0ABWdUJDAijncQLxN/l+XamTww2T3yWxTDIrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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