Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af07a438482fc9aba054e73cdc2758ea53ae3fe7f52a592ebf0f445898d8c0f2' 
  AND token = 'Dqgcoab7e+5mRx2HoDXJJnvdgKLmuiUzgSq5Ju4/mKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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