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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '84649152687ae6bb33b3f3ac7ec3376b0ae3f4f4afebbe0c6d742f1b8be15b68' 
  AND token = 'Muxxi1/FzqM/TrLgT6++fN6A9FUjf4zJh6g/8Gaqb64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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