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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4257cb8d0688b1aaa2d77b9f4651dd358b74f306d18d707d87cdabb2d2d4e518' 
  AND token = 'JKcTenVc1uoyxQsxd+eoQgJr7iJtC+aIA6sFTgc+k+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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