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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '72243bb521da728496ce8b144428c564331cabed6c8f6b9bec6819b838751e14' 
  AND token = 'qxzaOtysvZZQg3IWL6Bs4L8OIsp5G6ubXNoYaibOf60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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