Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7fcdc593fa07850bce05df3a8ca9aca637d9641af6b15a8fb3c91ded0647a3' 
  AND token = 'Ktl5l4A4YyCxDz0GlsxlH7fMYODjQVuBDp42uGHpuuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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