SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '03dc144c5f7add78f9fc262eb667675a0905f5dec1fb8722937346057b5f15d1' 
  AND token = 'DGbFK1eq02VbiI9fxYgxLGQ3hU7w/TtlQhMtuaslMQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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