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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '680e79d17576a61ebc511465ba7063c44003a6f095bddcb4b06f7743c1a2c05e' 
  AND token = 'dQeBdb7v4HtR9Rf1Pwn/yp+OQJNChH+JsaRotUiuHnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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