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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e4ffddae3ad25556a070db2c1424321371654a9443498a4db9728a55599c2777' 
  AND token = 'HVI38Jf3aofebuoR5I6bRkEX35u12fnNdhMma5Tabns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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