SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd60601b040498d8e74d0144033e0b2c9d7fdfe71e536ee92ca26a359d524471e' 
  AND token = 'dz0vlq5j+QIB/5/X4NREhVZrZCO83NPxV+9yHHLe4lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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