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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '25aa6fd365717e6206292dc1d65c2386f6b1cfe9c4816fec217c6007ec0706d2' 
  AND token = 'WqVt4tx7rUICrBbwI8PevnYJHR/r1FhlaO/P2DRty/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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