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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8850e34bdcef6a6988eef8523706c43fab14deab30f147d9c43b6ca27012779f' 
  AND token = 'mEZ4QP4pYJkK2a5NBVouUZelLxRb7fhmtTqeS65P4D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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