Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751f546f37ce7c2020df1615a4135736bd76ab15b7472ea2661f112a1c90967e' 
  AND token = 'M7iyI2xpL/LLz1Hd90gCak0tSxmJDoxUIrTK388pG5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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