Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f7ec5b3e50247f47caec3f4853dfdada2d0b2f9fd03e1fc54fddfc498c540a' 
  AND token = 'NiMThlD9x9lyFQUidzKleCytA57Rpz80alDztijF2S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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