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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '28bb6e13a8d1946426558a4402a36a394ef1ab179f509d6781e4fab3253f6147' 
  AND token = 'HSrh+wixqND5yxiONhj/GOdeDw1m7tEyqHKnpP2wELQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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