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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e29d447c31990b3f617d0579d31b8ae436c74d08f96ed0d01d5716a4b3451481' 
  AND token = 'Etg02uJ9TX3rzwdmHJKVzNAs9ImUtjT0IXuaRHsTAQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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