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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7d068690629d38e389070b874b749ee97c9618d54516fe38762333ce421b1f8' 
  AND token = 'HKDafW3U+4PNleZ8uulRTtScl/OkzOsL3dW+7PDkCdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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