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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd99cd195a421e8e3a6d47a04d2400719375ef6db12124147ad85783d94d74efb' 
  AND token = 'tQmt8dBQfYJ5MBk8BXJgsKYK0T2rrycMc/jEe3a4fzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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