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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '055226744eadab90e72616d24bdbecf98f18ba36705f487cdfe78fbf48c77a1c' 
  AND token = 'iR9WQDRmiL7rAi/N1vjGW5IO2mO5kHLsFw5TyX/zkJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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