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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6469351edf610ac567afd38ae5271d776b5fb7106e6f2c7e9fd9f3b3591d72d4' 
  AND token = 'UI+ddR7XPiC3tQQRFv2flR6ijohisrTitz3v+kIKukU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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