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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47b7ea5a62b1f9422ce0eb7ac6e98fb359fdf621e30fc8b7f8fe4ecaaf977882' 
  AND token = 'YJ6CFiqDGQm0wjiVDPoe3b1mNBxEfuG3nXfiVzwYe2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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