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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'de986f55705f1667823720ee7aa1e7ffbc4fe336b1c708fb45d840209e13038d' 
  AND token = 'e0wdZ0s6rq9cCmKhWDy6dBGKpJDOwxStIsiUW/nlPeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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