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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b644ba4fe5a8058cb6fefa61d12406ce1e0e826338ad32e1c6d8fbfe9e219bb2' 
  AND token = 'wFNmH3+QdC8L557LQwPDBzyAiwlkTe6ZmNvpEHmQP+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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