Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2e684704799ed42198a1eda082484b2e48777baf95c87f1cb0f640965320b4' 
  AND token = '06V6FyKdWZnPUjSgdDTB7pew8RS/YpYdBTiywfdXZDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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