Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54b61a2994ac5e4b4dc78c1f7cceba7c4a775cd0ea328dcab0b90ed3a5f58ed' 
  AND token = 'BplVPyRbvpXsSTg6zj9uH3Fwn3hsQovUYk1mPL2RPCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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