Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ea783e08a7dcbef42df5304fc75098f7befd5b236fbc2bfb42986b3f780087' 
  AND token = 'VG/sLw5JbIyfQ7kIMBn9ldNEeSxLpPOVk1DzwV7M+9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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