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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '21c7a79b55f75fbbf1dd1bedcbc6fd7de8f082cdf535dac7ab131d9bc895dd1d' 
  AND token = 'l258ZTbliHC7AM6QotjZjjIlsIZPCcbKX4meUPYMIjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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