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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd9ab63ab901b4246481ee66f7c504ac400ac18ba3750b42ae0e8a1fd3b3b6078' 
  AND token = '+4zqQvK2SzVAJwXlkPFzH1XJRQW8GXUje4l88FqPad4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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