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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6b586092876ed34366f976dad55791d51b994eef27b93ba9e900d16b114cc628' 
  AND token = 'hn5cpnTKK6q/0ty30YIdjCazi8vOiA7y8l5EIJbkXss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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