SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5a763b45711d612d2ad3a78339de0d9c78b492c48bb19223d46306a51bbc5d94' 
  AND token = 'NgIxrPwx9Y5QAjWyVm93lmakq5nCf5F5sn68+vc7/LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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