SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d009d8723a09ce4227a73e072c947134e980dc24d45486d0fdec7f379ff8b10' 
  AND token = 'cBRHDlBVBWJepT1uuVss2zJ7yWHwmKXHpGPVwJZBBF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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