Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e26ce453e24fd82baddd89a3ad5cd12e7c34e9fb6ab8a00b04b8f6f4b73c78c' 
  AND token = 'X+IR/TbA1FNKNr2drpL2YQ73v885PdMZEWLwKR6w8A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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