Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d57e73f90d3ee04c9c49e66772f2d327bef65ca5b472a7b8eb74b70476459ce' 
  AND token = 'xl6LOckUV25YN4idDil0u7hWg/ByOw393HcP+gfew80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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