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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9aab3c5a4b6151faf1c217090b9e19d419fb30cad52e76569df4908e1a1192f1' 
  AND token = '6pAuBR3vSXzz19ttcfho7vg7gA2mz9xBVfxH8iwn4/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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