Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6792aa51bb145b368964f35f9f2dff3e8d34e06323da84407cafdf51573b0a5e' 
  AND token = 'l27ulQb5JLQ/4cpV7giRvBd/kE965wQxw5ANahtqBxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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