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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd018e66cf19c895df09274b64ddc94c8ef7616e0c644e01d08e7d3664834710b' 
  AND token = '7LmjY6SxyJqs71+Bl6lL7YeEZ1d8CV4Sbf4czye86O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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