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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b47429f5c992cc57ecd7b231adfaa7d0e1fc67eef3f129dd5c942c89cf20c464' 
  AND token = 'YzhmNHKmNrVpGmoS6JMOcpCgNQLgS988pe88FOaNHyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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