Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb56550f4fb0dcd09edddc2b273c5591251995970494ea739ce04131f34ea75' 
  AND token = 't7MenF6iFfVyujOY4ushL6BIrNYiuXnhD9T9+xJFpYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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