SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9cc29956cdcd9ba6d4e2e688e8a0af73c417c0e68cc0cb681dd77051479b4852' 
  AND token = 'z09MBo2PLl/XxQVY4jugoE3kcKdX8iwOIw8Z+Tfjk48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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