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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0a48eac1821ab70c5938ba0b4447ea0f20427c35952581464a7516d6ceca1919' 
  AND token = 'dQNiYdkg3W4IZYMmLlRYrbc/bEXuV54zJ3AanmvmAhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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