Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ea91ffe03ffa078a0f8fcd481baf033ca04dd69a2cce82a9dc22117ef6917d' 
  AND token = 'i5c4WPtTFMN909NkJ+YTBbK5+3U9uOAWUz6p65z4VHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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