Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f4949348191b9618f5731e1c94b06125ff8385d473d20a6e63e4e0939265f7' 
  AND token = '0T7a2gmrbzT7lPeZMG9mqhoS/+yxkllizYZWyt/Nj4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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