Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f16ad86042e710578c79af398578372315af10dd2f45fc6ecf14e1a1634a64' 
  AND token = '+gxBiN4um8GR66sDYMzgxTq6EGj+pMXkaDZV4AT2DLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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