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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9c362855e13ce751571028308547c2be7e027f2cc68c4699ae539f3469eced3a' 
  AND token = 'wehcVeCg1h882xvNgImrL1d4OOgO97xqgjUtDGrfWC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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