Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d46ba0f795f16c1953ab781e8951c792a694df99e35082a3d91e53dcab20edc' 
  AND token = 'G5MBH3l1cz91FBZLvnh/smS7895EC2SELsuVnl6pmVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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