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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9ff65b9da45a6d5f5cb489b2ea2bddd12f483f3cd5703e7c393bccd2783ee88d' 
  AND token = 'iaN3yjD2A0stS6uIjpLtt3i3ASjEJcr3ywwgWrMFaLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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