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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0413af3904c3872c4ec85ff0945b6efdb207d2d06317af9230452f9b2025ead2' 
  AND token = 'xR4uZZz/nTZU/86aVy9utPdq/Z8Z06AAiZ/mjRF3soE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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