Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99aa549f3c806ea3a7fc15bff1c3e6cef0bab20f5512e3a7b76a0dfd019fe358' 
  AND token = '52yawAzGJRtIz/FLCYmL01ORflFvhSDMUyC+87WnYUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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