SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '75d6c063e11e804682bd74559998daf06a1989b70bd37420c7667fa8b2edfa71' 
  AND token = 'ueFCTI+d8hML+weTcbFiJPETkRv/swuD2vH8FowVGKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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