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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6a5f89388986e69e4c4bb5ad4a4aac4b61808733302a2e93fe6b2adc348471cf' 
  AND token = 'AZAAh4qG6JGGdTjzoKKtfNjxr0C/onK3kZSaqlNoIDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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