SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f26b63aa38f1ca6dcb804ae9ca5cb094f58dc5f3e522d34927ee695b0feb10d5' 
  AND token = 'goUioohNaFgkW/pPuuMKsoD6iB2VmMI6iWz+hxzLGiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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