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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'de1e039488b6454bf65e2739db4422ce991ac91fbc560e5165b952750cdc7de8' 
  AND token = 'ny2Zyqr/b2xXx5/Uflc5HnPuvsefW97AfgWDrM5qFHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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