Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b330e2c7c29a0e50b0306b5f1e336b7ea712d1b9806f98d004a604839a2c3c' 
  AND token = 'FXLsIg/yU/FLCtK+y+gZhuktHDrbWfcssusKGVt2oHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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