SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f34460c8b40e5aa606f630203d2c6c7f099ac085b0f75ff3c6b73f2e78e2839d' 
  AND token = 'DJ1mYlONCrikGz4MjcORi3WNDb/8SUN6iPghC9CLgBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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