Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f10dd53722d7d13e6861eb778b9931616ac094d6b562daed0cae602e9112456' 
  AND token = '/MHP+JPsgMfmigtu3V5TvMsgaiskIkh5rlbhLjgex3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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