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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae11df3a20bad9e17ac6e4171b852cf59e8446081b2af00f4731f5f6f33686f0' 
  AND token = 'dMJVGW0Zei9wx1Xeba0A0/JJnjSrNxr0wOT5PwlH7ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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