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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'dcd6bc84fb30ac29536d21cb1b96ce59809638b9a8f1119a8c8aaa0c95932f61' 
  AND token = 'uTn/aP+LY8A6YZ3dQZ10gvvg/eewg67+EH3P3AdNR0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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