Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf3e78a0c5bef0214ee76dab681ded8ad90e5a96cdef5a170609befc58dc41d' 
  AND token = 'b7lhR378AE2p8Mw04fCtqGfCAyeOPN+H/yeeI5RH2nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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