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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c0b76e3052a343042d41542ae3de69b30005389b238054e8d2205c284843395d' 
  AND token = '/bbDJP2R87OqQg0hZDr3qyqoKQBI/3xf8EQJkqBtaKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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