Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388582728ef0ad6a1739f7c18aeb92ee0131e67b3d49a0c1f52285874fb87121' 
  AND token = 'UrcCb8AKX0a3d391obsswOVoDBcqmhr7uXaumYg3evw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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