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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '17a7dbfb0ef737ff8f8948ff8b3da70e5c3f304af834f7db358e6847a938d05a' 
  AND token = 'icTJ53LQj77YYMnMHiruk2ldGtHUf48x4RMc1hn9vMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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