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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '313ea8cfe3fa5a46e5a0c0eaa3052ca56bf208194265519c15390342f628aa44' 
  AND token = 'hLEWYsw7RBBAe4bvtDh0J7SDl9qN/HbHq9658FeEySA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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