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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4ceeb6434a9b34e359cb7ef042a597a236a35b31dda02d91de0c6a07081d265b' 
  AND token = 'nZmkPD4plCyevlzLotktjFu9H2+soQCx/P2yjf6iFOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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