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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3c246289080e9af0ceb4c1c74fc9c9fa0dff09e7663f46d9d70399ce3a8371fd' 
  AND token = '8FiI7krjqJItyYy16fK3QXNMDk9eWJDzf2Fnoi8OUFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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