Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363c5773ca84db8646be03e58af9a7dec0615f57dcde64600385e092abcc59b8' 
  AND token = 'p8PKmtjaNacB9XEkQ9OvW2hDWQH/ZwN4DbAN5jdkTL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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