SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2f9343381432e4ce521d484eef6629af1b8144da71a1c585dd6f8c684a8186d8' 
  AND token = 'mqgSBpVi7IEYMK4uoi+VcsFXR9EG0PK7IomkVWYvIKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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