Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124b8b77dd9a0f166d065f0c500c03d6c065a8c6f091e71ad9374cac3f431ec3' 
  AND token = '/kVIb0+fgkd9b9RtKq7+GkqmtY2xOZlYPLqY1gT+x2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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