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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'deb9bd9c20322ac2ac4ac42236255948498dc96c0a67028c4e507aeae318af72' 
  AND token = 'e9XGLefCsi5ugIg1SEf2lAdDs6+oAjIvzuEU4X81mKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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