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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fe5affc0380f7609cb0d55bef0da5f3f63180184e1e4c7b39a84607e896e2183' 
  AND token = 'lGT7Vr6X3iliRirJIbUntTYgaDE62Bgm9SznZ9GzS8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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