Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c4ca4e8e1060773b863b2057197e2fd16c6afe42c3c3bf37b6e2fcd7a4c3d4' 
  AND token = 'hFN4YaHcGkeLMgHJ9cWMULG5Uo0ULMo47agHrPjbNvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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