SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b86271167284a2f69c6d0e5cace323c5c41ed5ad67efac4f1e1b0f49b5753a89' 
  AND token = 'e3iuKiwIpxnk97um3te0Vyhrd/cZohuoiKyrqyDjYmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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