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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '861cb40df4113bd9ce2a96b0d22f509dc30de67a35b4f7386b49bfced8c9257e' 
  AND token = '3O1mOSmTnrV/4/bDI5f3+Z44QzZjAi1ldog0OusJdL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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