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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3172b665cfcff49a7a44433d06a8465f1f0531abb12d38e684996b79a33f22f8' 
  AND token = 'tG7jVLXThdvYddlP23ekE/84IdVrqtE7OMvkisYPa3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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