SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b0287fb10635b56089dd855167e490dcf7e4bdcfd256cc04540a64e0f6c76974' 
  AND token = 'e//F9ZjWB+sh4QLpvKrWinolDjeGO7L1Vsn7pJpVXoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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